Title page for ETD etd-0501102-153840

Document Type	thesis
Author Name	Venkatachari, Badrinath
URN	etd-0501102-153840
Title	Better Admission Control and Disk Scheduling for Multimedia Applications
Degree	MS
Department	Computer Science
Advisors	Mark L. Claypool, Advisor
Keywords	multimedia disk scheduling admission control
Date of Presentation/Defense	2002-05-01
Availability	unrestricted
Abstract General purpose operating systems have been designed to provide fast, loss-free disk service to all applications. However, multimedia applications are capable of tolerating some data loss, but are very sensitive to variation in disk service timing. Present research efforts to handle multimedia applications assume pessimistic disk behaviour when deciding to admit new multimedia connections so as not to violate the real-time application constraints. However, since multimedia applications are ``soft' real-time applications that can tolerate some loss, we propose an optimistic scheme for admission control which uses average case values for disk access. Typically, disk scheduling mechanisms for multimedia applications reduce disk access times by only trying to minimize movement to subsequent blocks after sequencing based on Earliest Deadline First. We propose to implement a disk scheduling algorithm that uses knowledge of the media stored and permissible loss and jitter for each client, in addition to the physical parameters used by the other scheduling algorithms. We will evaluate our approach by implementing our admission control policy and disk scheduling algorithm in Linux and measuring the quality of various multimedia streams. If successful, the contributions of this thesis are the development of new admission control and flexible disk scheduling algorithm for improved multimedia quality of service.
Files	venkatachari.pdf

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